package netbolt

import (
	"bytes"
	"compress/gzip"
	"encoding/binary"
	"encoding/gob"
	"encoding/json"
	"errors"
	"github.com/satori/go.uuid"
	"io/ioutil"
	"log"
	"os"
	"strings"
)

type SerializeType int

const (
	BIN SerializeType = iota
	GOB
	JSON
	PROTOBUF
)

const (
	SUCESS_MSG = "OK"
)

var (
	DEBUG             = true
	NOT_SUPPROT_ERROR = errors.New("NOT SUPPORT!")
	CREATE_DB_ERROR   = errors.New("create db error!")
	DB_EXIST_ERROR    = errors.New("db already exist!")
	DB_NOT_FOUND      = errors.New("db not found!")
	LOGIN_FAIL        = errors.New("login fail,please try username huhong!")
	TICKET_FAIL       = errors.New("503")
	NOT_OPEN_CURSOR   = errors.New("not open cursor!")
	ErrLog            = log.New(os.Stderr, "[ERROR]", log.LstdFlags|log.Llongfile)
	WARNLog           = log.New(os.Stderr, "[WARN]", log.LstdFlags|log.Llongfile)

	DEBUGLog = log.New(os.Stdout, "[DEBUG]", log.LstdFlags|log.Llongfile)

	Logger = log.New(os.Stdout, "[INFO]", log.LstdFlags)
)

type Serializer interface {
	ToBytes(obj interface{}) ([]byte, error)
	FromBytes(b []byte, obj interface{}) error
}

type BinarySerializer struct {
}

//c,c++中使用小字节序
//java中使用大字节序
//只能给定长类型使用
func (s BinarySerializer) ToBytes(obj interface{}) ([]byte, error) {
	buf := new(bytes.Buffer)
	err := binary.Write(buf, binary.BigEndian, obj)
	return buf.Bytes(), err
}

//只能给定长类型使用
func (s BinarySerializer) FromBytes(b []byte, obj interface{}) error {
	buf := bytes.NewBuffer(b)

	return binary.Read(buf, binary.BigEndian, obj)
}

type GobSerializer struct {
}

func (g GobSerializer) ToBytes(obj interface{}) ([]byte, error) {
	var buf bytes.Buffer
	encoder := gob.NewEncoder(&buf)
	err := encoder.Encode(obj)
	if err != nil {
		return []byte{}, err
	} else {
		return buf.Bytes(), nil
	}
}

func (g GobSerializer) FromBytes(b []byte, obj interface{}) error {
	buf := bytes.NewBuffer(b)
	decoder := gob.NewDecoder(buf)
	return decoder.Decode(obj)
}

type JsonSerializer struct {
}

func (j JsonSerializer) ToBytes(obj interface{}) ([]byte, error) {
	return json.Marshal(obj)
}

func (j JsonSerializer) FromBytes(b []byte, obj interface{}) error {
	return json.Unmarshal(b, obj)
}

func NewSerializer(tpe SerializeType) (Serializer, error) {
	var ser Serializer
	var err error
	switch tpe {
	case BIN:
		ser = &BinarySerializer{}
	case PROTOBUF:
		err = NOT_SUPPROT_ERROR
	case JSON:
		ser = &JsonSerializer{}
	case GOB:
		ser = &GobSerializer{}
	}

	return ser, err
}

func FileExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return true, err
}

func CRC_CCITT(byteArray []byte) uint16 {
	var crc uint16
	for i := 0; i < len(byteArray); i++ {
		b := uint16(byteArray[i])
		q := (crc ^ b) & 0x0f
		crc = (crc >> 4) ^ (q * 0x1081)
		q = (crc ^ (b >> 4)) & 0xf
		crc = (crc >> 4) ^ (q * 0x1081)
	}
	return (crc >> 8) ^ (crc << 8)
}

var crc16tab = [256]uint16{
	0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
	0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
	0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
	0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
	0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
	0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
	0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
	0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
	0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
	0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
	0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
	0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
	0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
	0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
	0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
	0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
	0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
	0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
	0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
	0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
	0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
	0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
	0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
	0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
	0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
	0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
	0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
	0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
	0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
	0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
	0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
	0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0}

func CRC16(bs []byte) (crc uint16) {
	l := len(bs)
	for i := 0; i < l; i++ {
		crc = ((crc << 8) & 0xff00) ^ crc16tab[((crc>>8)&0xff)^uint16(bs[i])]
	}

	return
}

func UUID() string {
	id, _ := uuid.NewV4()

	return strings.Replace(id.String(), "-", "", -1)
}

func FULL_UUID() string {
	id, _ := uuid.NewV4()
	return id.String()
}

func UUIDByes() []byte {
	id, _ := uuid.NewV4()
	return id.Bytes()

}

func GZIPCompress(buf []byte) ([]byte, error) {
	var buffer bytes.Buffer

	writer := gzip.NewWriter(&buffer)

	_, err := writer.Write(buf)
	if err != nil {
		writer.Close()
		return nil, err
	} else {
		writer.Close()
	}

	return buffer.Bytes(), nil
}

func GZIPUnCompress(buf []byte) ([]byte, error) {
	buffer := bytes.NewBuffer(buf)
	r, err := gzip.NewReader(buffer)
	defer r.Close()
	if err != nil {
		return nil, err
	}
	b, err := ioutil.ReadAll(r)
	return b, err
}
